Well I came from owning a 05 STi. Bolt ons for that car got you crazy power for dirt cheap but the stock turbo maxed out really fast. After the basics, you had to go with a bigger turbo for any substantial gains. Don't think upgrading the turbo on that car was cheap either. I priced out a modest build (~450-475 awhp) and it was going to cost around 10K.
I can put 6-7K into a supercharger for the Z and be right about there. So really it depends on your ultimate goal. If you want a nice jump in power for cheap, the Z isn't going to cut it. If you want 450-500 whp, then it's actually a decent platform to start with.
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